What is the angle?

what is the angle between 0 and 2π in radians that is coterminal with the angle 145π in radians

2 Answers
May 24, 2018

The coterminal angle is 4π5

Explanation:

Please observe that 14π5>2π, therefore, we subtract 2π from 14π5:

14π52π=14π510π5=4π5

May 24, 2018

6π5

Explanation:

Call t the angle (or arc).
t=14π5=4π5+10π5=4π5+2π
t=4π5
The co-terminal angle (or arc) to t=4π5 is:
u=2π4π5=10π54π5=6π5